Not long ago, the rapper Chester Watson played a show in Brooklyn to support the release of his short, assured new album, Project 0. After the performance, he and fellow Nü Age Syndicate member Kent Loon met a guy from Italy who knew all the words to Watson’s song “Phantom.” “We were smoking, and he just started spitting it, and I was like, ‘Holy shit!'” Watson recounts. “He had this super strong Italian accent, too, so it was trippy.”...